JP5592221B2 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
JP5592221B2
JP5592221B2 JP2010225755A JP2010225755A JP5592221B2 JP 5592221 B2 JP5592221 B2 JP 5592221B2 JP 2010225755 A JP2010225755 A JP 2010225755A JP 2010225755 A JP2010225755 A JP 2010225755A JP 5592221 B2 JP5592221 B2 JP 5592221B2
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Japan
Prior art keywords
electrode
case
portion
part
secondary battery
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Expired - Fee Related
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JP2010225755A
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Japanese (ja)
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JP2011086623A (en
Inventor
俊植 金
保中 黄
承宰 李
有名 姜
性洙 金
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三星エスディアイ株式会社Samsung SDI Co.,Ltd.
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Priority to US25124309P priority Critical
Priority to US61/251243 priority
Priority to US12/860,692 priority patent/US8974952B2/en
Priority to US12/860692 priority
Application filed by 三星エスディアイ株式会社Samsung SDI Co.,Ltd. filed Critical 三星エスディアイ株式会社Samsung SDI Co.,Ltd.
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0202Cases, jackets or wrappings for small-sized cells or batteries, e.g. miniature battery or power cells, batteries or cells for portable equipment
    • H01M2/0207Flat-shaped cells or batteries of flat cells
    • H01M2/0212Flat-shaped cells or batteries of flat cells with plate-like or sheet-like terminals
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0277Insulating material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0285Conductive material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/22Fixed connections, i.e. not intended for disconnection
    • H01M2/26Electrode connections
    • H01M2/266Interconnections of several platelike electrodes in parallel, e.g. electrode pole straps or bridges
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/30Terminals
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • H01M2/0257Cases, jackets or wrappings characterised by the material
    • H01M2/0287Cases, jackets or wrappings characterised by the material comprising layers

Description

  The present invention relates to a secondary battery, and more particularly, to a structure of a case that accommodates an electrode assembly.

  The secondary battery includes an electrode assembly including a positive electrode, a separator, and a negative electrode, a case that houses the electrode assembly, and an electrode terminal that is connected to the electrode assembly and is drawn out of the case. The case is manufactured from, for example, a laminate sheet in which a metal layer and a resin layer are bonded. Usually, a secondary battery provided with such a case is called a pouch-type battery.

  In a normal pouch-type battery, the positive electrode uncoated region and the negative electrode uncoated region of the electrode assembly are fixed to the positive electrode terminal and the negative electrode terminal by welding, respectively, and the entire electrode assembly impregnated with the electrolyte, the positive electrode terminal, and the negative electrode terminal Part of the housing is housed in the internal space of the case, and the periphery of the upper case and the lower case is sealed and bonded by heat sealing.

  By the way, in the structure mentioned above, the welding site | part of an electrode assembly and an electrode terminal, the sealing site | part of an upper case and a lower case, and the drawing-out site | part of an electrode terminal are located in order on the outer side of an electrode assembly. Accordingly, since the portion that does not actually contribute to the battery reaction in the entire secondary battery occupies a large area, the entire volume is expanded, which is disadvantageous for increasing the capacity and compactness of the secondary battery.

  Further, in the process of heat-sealing the upper case and the lower case, the upper case is dip-drawn and sealed to the lower case. In this case, since the periphery of the upper case becomes weak due to dip drawing, the case can be easily damaged by an external impact, and as a result, the reliability of the secondary battery may be lowered.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to reduce the area of the portion outside the electrode assembly that does not actually contribute to the battery reaction, thereby increasing the capacity and It is an object of the present invention to provide a new and improved secondary battery advantageous for downsizing. Furthermore, an object of the present invention is to provide a secondary battery that can improve the reliability and structural safety by omitting the dip drawing process of the upper case and increasing the durability of the case. is there.

In order to solve the above problems, according to an aspect of the present invention, a central electrode part including a positive electrode, a negative electrode, and a separator; a first electrode part extending from a first end of the central electrode part; A second electrode portion extending from a second end located on the opposite side of the first end; a central case surrounding the central electrode; a first electrode case having electrical conductivity surrounding the first electrode; and A secondary battery including a second electrode case having electrical conductivity surrounding the second electrode part is provided.

  The first electrode case is fastened to the central case, and the overlapping portion of the first electrode case surrounds a part of the central electrode portion at the first end, and the central case is the first electrode. Surrounding the overlapping portion of the case, the second electrode case is fastened to the central case, the overlapping portion of the second electrode case surrounds a part of the central electrode portion at the second end, and the central case May be formed so as to surround the overlapping portion of the second electrode case.

  The central case may include a material different from at least one of the first electrode case and the second electrode case.

  The central case may include a laminate sheet in which a metal layer and a resin layer are bonded by an adhesive layer, and the first electrode case and the second electrode case may include a hard metal.

In addition, at least one of the first electrode case and the second electrode case may be formed with an inclined portion on an outer shape, and at least one of the first electrode case and the second electrode case may have an outer shape. An inclined portion having an inclination angle substantially perpendicular to the angle may be formed .

In addition, at least one of the first electrode part and the second electrode part may include a bending part and a current collecting part. Furthermore, the first electrode case includes a first housing portion surrounding the curved portion of the first electrode portion and a second housing portion surrounding the current collecting portion of the first electrode portion, and the second electrode The case may include a first housing portion that surrounds the curved portion of the second electrode portion and a second housing portion that surrounds the current collecting portion of the second electrode portion.

Further, at least one of the overlapping portions of the first electrode case or the second electrode case and at least one of the corresponding second accommodating portions of the first electrode case or the second electrode case are substantially The first accommodating part includes an inclined part that connects the overlapping part and the second electrode case and is inclined with respect to the overlapping part. May be.

Further, at least one of the overlapping portions of the first electrode case or the second electrode case and at least one of the corresponding second accommodating portions of the first electrode case or the second electrode case are substantially The first housing part may include an inclined part that connects the overlapping part and the second electrode case and is inclined substantially at a right angle from the overlapping part .

  In addition, a sealing part may be further included between at least one of the overlapping portion of the first electrode case or the second electrode case and the central case.

In addition, a sealing part may be further included between the second housing part and the central case of at least one of the first electrode case or the second electrode case, and the first electrode case or the second electrode case. At least one may be formed with an inclined portion having an inclination angle substantially perpendicular to the outer shape .

  In addition, at least one of the first electrode part or the second electrode part corresponds to a recess formed in the second accommodating part of the corresponding first electrode case or second electrode case. It may be fixed to the first electrode case or the second electrode case.

  In addition, at least one of the first electrode part or the second electrode part includes the opening formed in the second accommodating part of the corresponding first electrode case or second electrode case, It may be fastened through an opening formed in the current collecting part of the corresponding first electrode part or second electrode part.

  The first electrode part and the second electrode part may be fastened to the corresponding first electrode case or second electrode case by a conductive fastening member.

  In order to solve the above problem, according to another aspect of the present invention, a central electrode part including a positive electrode, a negative electrode, and a separator; a first electrode part extending from a first end of the central electrode part; A second electrode part extending from a second end located opposite to the first end of the electrode part; a central case surrounding the central electrode part; a first electrode case surrounding the first electrode part; and the first There is provided a secondary battery including a second electrode case surrounding a two-electrode portion, wherein at least one of the first electrode case and the second electrode case is bent.

  In addition, at least one of the first electrode case and the second electrode case may be bent substantially at a right angle.

  In addition, at least one of the first electrode part or the second electrode part may include a bending part and a current collecting part.

  The first electrode case includes a first housing part surrounding the curved part of the first electrode part and a second housing part surrounding the current collecting part of the first electrode part, and the second electrode The case may include a first housing portion that surrounds the curved portion of the second electrode portion and a second housing portion that surrounds the current collecting portion of the second electrode portion.

  In addition, at least one of the first electrode case or the second electrode case is between at least one of the first electrode case and the second electrode case. It may be bent with an angle.

  Further, at least one of the first electrode case and the second electrode case may be formed so as to be substantially perpendicular to each other.

  The current collector of the first electrode part is fixed to the first electrode case by a recess formed in the second housing part of the first electrode case, or the current collector of the second electrode part. The portion may be fixed to the second electrode case by a recess formed in the second housing portion of the second electrode case.

  The current collector of the first electrode portion includes an opening formed in the second housing portion of the first electrode case and a corresponding opening formed in the current collector of the first electrode portion. The current collecting part of the second electrode part is fastened to the first electrode case through an opening formed in the second housing part of the second electrode case and the current collecting part of the second electrode part. It may be fastened to the second electrode case through a corresponding opening formed in the electric part.

Further, at least one of the first electrode part or the second electrode part may be fastened by a conductive fastening member.


  The electrode terminal may further include an electrode terminal fastened to the second housing part of the first electrode case or the second housing part of the second electrode case.

  In addition, at least one of the first electrode case and the second electrode case may include an electrode terminal.

  The central case may include a material different from at least one of the first electrode case and the second electrode case.

  The central case may include a laminate sheet in which a metal layer and a resin layer are bonded by an adhesive layer, and the first electrode case and the second electrode case may include a hard metal.

  As described above, according to the present invention, the width of the outer part of the electrode assembly that does not actually contribute to the battery reaction in the entire secondary battery can be effectively reduced. Therefore, a more compact secondary battery can be manufactured by increasing the width of the electrode assembly to increase the battery capacity or reducing the width of the outer portion of the electrode assembly. In addition, the electrode assembly can be more securely protected, and the structural safety of the secondary battery can be improved, and damage due to external impacts and vibrations can be minimized.

1 is a perspective view of a secondary battery according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the secondary battery illustrated in FIG. 1. It is sectional drawing of the secondary battery shown in FIG. It is sectional drawing of the secondary battery which concerns on 2nd Embodiment of this invention. It is sectional drawing of the secondary battery which concerns on 3rd Embodiment of this invention.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  FIG. 1 is a perspective view of a secondary battery according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the secondary battery shown in FIG.

  As shown in FIGS. 1 and 2, the secondary battery 200 according to the first embodiment includes an electrode assembly 10, a positive electrode case 20 that accommodates the electrode assembly 10 in three regions, a negative electrode case 30, and a center. A case 40 is included. The positive electrode case 20 and the negative electrode case 30 surround one end and the opposite end of the electrode assembly 10, respectively. The central case 40 surrounds the entire central portion of the electrode assembly 10 and part of the positive electrode case 20 and the negative electrode case 30.

  The electrode assembly 10 may be formed by being wound in a jelly roll form, folded in a zigzag manner and stacked, or may be configured by stacking a positive electrode, a negative electrode, and a separator manufactured by a single plate. Good. In FIG. 2, a laminated electrode assembly is shown as an example. In the electrode assembly 10, the positive electrode 11 and the negative electrode 12 are alternately and repeatedly stacked with a separator 13 interposed therebetween. The separator 13 has a smaller width than the positive electrode 11 and the negative electrode 12, and is disposed at a certain distance from the periphery of the positive electrode 11 and the negative electrode 12.

  Thereby, a part of the positive electrode 11 is exposed to the outside of the separator 13 at one end of the electrode assembly 10, and a part of the negative electrode 12 is exposed to the outside of the separator 13 at the opposite end of the electrode assembly 10. . A part of the exposed positive electrode 11 is a positive electrode uncoated portion 14 in which a positive electrode active material is not applied to the positive electrode current collector, and a part of the exposed negative electrode 12 is a negative electrode active material applied to the negative electrode current collector. There is no negative electrode plain portion 15.

  Accordingly, the electrode assembly 10 includes a central portion 16 where the separator 13 is located, a positive electrode plain portion 14 located at one end of the central portion 16, and a negative electrode plain portion 15 located at the opposite end of the central portion 16. And may be divided into

  The peripheral edges of the positive electrode plain portion 14 and the negative electrode plain portion 15 are brought into close contact with each other by pressurization and then joined by a method such as welding. For convenience, the portions of the positive electrode uncoated portion 14 and the negative electrode uncoated portion 15 that gather toward a part so that the distance between them becomes closer are called curved portions 141 and 151, and the regions joined to each other are called the positive electrode current collecting portion 142 and the negative electrode It will be called a current collector 152.

  The positive electrode current collector 142 and the negative electrode current collector 152 are positioned at the center of the electrode assembly 10 along the thickness direction of the electrode assembly 10 or the electrode assembly 10 along the thickness direction of the electrode assembly 10. It may be biased to one side. FIG. 2 shows the latter case.

  FIG. 3 is a cross-sectional view of the secondary battery shown in FIG.

  As shown in FIGS. 1 and 3, the positive electrode case 20 is coupled to the positive electrode current collector 142 and electrically connected to each other, and integrally forms the positive electrode terminal 21 protruding outward. The negative electrode case 30 is coupled to the negative electrode current collector 152 and electrically connected to each other, and integrally forms the negative electrode terminal 31 protruding outward. The positive electrode case 20 and the negative electrode case 30 are made of a hard metal having high electrical conductivity.

  The positive electrode case 20 includes a curved portion 141 and a first housing portion 22 that surrounds the central portion 16 facing the curved portion 141, and a second housing that is positioned outside the first housing portion 22 and surrounds the positive electrode current collector 142. The accommodating part 23 and the positive electrode terminal 21 located in the outer side of the 2nd accommodating part 23 are included. The first housing part 22, the second housing part 23, and the positive electrode terminal 21 are all connected together.

  That is, the positive electrode case 20 includes the positive electrode terminal 21, the first housing portion 22, and the second housing portion 23. The 1st accommodating part 22 is a site | part for enclosing the curved part 141 and a part of center part 16 located in the part close | similar to the curved part 141. FIG. The second housing part 23 is a part for surrounding the positive electrode current collector part 142. As shown in FIG. 3, the positive electrode terminal 21 is integrally connected to one side of the second housing part 23, and the first housing part 22 is integrally connected to the other side of the second housing part 23. .

  The first accommodating portion 22 is configured in a substantially rectangular parallelepiped shape in which one side surface is opened, and the one surface is configured by a linear portion 24 that faces the central portion 16 and an inclined portion 25 that covers the curved portion 141. Also good.

  When the positive electrode current collector 142 is positioned at the center of the electrode assembly 10 along the thickness direction of the electrode assembly 10, the inclined portions 25 may be positioned above and below the curved portion 141. On the other hand, when the positive electrode current collector part 142 is located on one side along the thickness direction of the electrode assembly 10, one inclined part 25 may be located outside the curved part 141. FIG. 2 shows the latter case.

  The second housing part 23 forms an internal space into which the positive electrode current collector part 142 is inserted. The positive electrode current collector 142 is fixed to the second housing 23 by welding. For this purpose, the second housing part 23 is provided with at least one recess 26 to partially reduce its thickness, and the second housing part 23 and the positive electrode current collector 142 are fixed by spot welding in the recess 26. . The concave portion 26 may be provided so as to be symmetrical with each other on the upper surface and the lower surface of the second housing portion 23.

  Accordingly, the entire positive electrode case 20 including the positive electrode terminal 21 is electrically connected to the positive electrode 14 by the coupling of the second housing portion 23 and the positive electrode current collector 142. Thus, the positive electrode case 20 has both an effect as an input / output terminal and an effect as an exterior structure.

  The negative electrode case 30 is configured in the same shape as the positive electrode case 20, and the entire second negative electrode case 30 including the negative electrode terminal 31 is electrically connected to the negative electrode 15 by fixing the second housing portion 33 and the negative electrode current collector 152 integrally by welding. Connected to In FIG. 3, the reference numeral 32 indicates the first housing part 32 of the negative electrode case 30, and the reference numerals 34 and 35 indicate the straight part 34 and the inclined part 35 of the first housing part 32, respectively. Reference numeral 36 indicates the concave portion 36 of the second accommodating portion 33.

  The central case 40 surrounds the entire central portion 16 of the electrode assembly 10 and part of the first housing portions 22 and 32 of the positive electrode case 20 and the negative electrode case 30, and is joined to the positive electrode case 20 and the negative electrode case 30 to be attached to these cases. Fixed. The central case 40 may be manufactured by a laminate sheet in which a metal layer and a resin layer are bonded by an adhesive layer.

  The central case 40 is joined to the outer surfaces of the straight portions 24 and 34 of the positive electrode case 20 and the negative electrode case 30 by heat sealing. In FIG. 3, reference numeral 41 indicates a sealing part between the positive electrode case 20 and the central case 40 and a sealing part between the negative electrode case 30 and the central case 40.

  Therefore, the sealing part 41 of the positive electrode case 20 and the central case 40 corresponds to the central part 16 of the electrode assembly 10 and is located inside the joint part of the positive electrode current collector 142 and the second housing part 23. The sealing part 41 of the negative electrode case 30 and the central case 40 also corresponds to the central part 16 of the electrode assembly 10 and is located inside the joint part of the negative electrode current collector 152 and the second housing part 33.

  In the secondary battery 200 having the above-described structure, the sealing portions 41 of the cases 20, 30, and 40 are positioned inside the positive current collector 142 and the negative current collector 152, and the positive current collector 142 and the negative current collector 152 are connected to each other. By positioning the positive electrode terminal 21 and the negative electrode terminal 31 immediately outside, the width of the outer portion of the electrode assembly 10 that does not actually contribute to the battery reaction in the entire secondary battery 200 can be effectively reduced.

  Accordingly, the width of the electrode assembly 10 is increased in comparison with the same secondary battery size to increase the battery capacity, or the width of the outer portion of the electrode assembly 10 is reduced in comparison with the same electrode assembly size. Or a more compact secondary battery can be manufactured. Thus, since the secondary battery 200 of 1st Embodiment can raise a space utilization degree, it is advantageous to high capacity | capacitance and compactization.

  Further, the central case 40 made of a laminate sheet does not have a bending portion. That is, instead of the central case 40, the positive electrode case 20 and the negative electrode case 30 have a bent portion (a boundary portion between the straight portion and the inclined portion; that is, a bent portion), but the positive electrode case 20 and the negative electrode case 30 are made of a hard metal. Therefore, the bending portion does not affect the strength of these cases.

  Accordingly, the central case 40 does not generate structural weakness due to dip drawing, and may have a thickness of 0.15 mm to 1 mm thicker than a normal laminate sheet, preferably 0.2 mm to It may have a thickness of 0.5 mm. As a result, the secondary battery 200 of the first embodiment can realize a thick battery having an overall thickness of 10 mm or more, can more securely protect the electrode assembly 10, and is structurally safe. It is possible to minimize damage caused by external impact and vibration.

  1 and 2, the positive terminal 21 and the negative terminal 31 may form at least one opening 27, 37. The openings 27 and 37 are for coupling with a connecting member (not shown), and the connecting member is used when a plurality of secondary batteries 200 are connected in series or in parallel to form a battery module. Is done.

  FIG. 4 is a cross-sectional view of a rechargeable battery according to the second embodiment of the present invention.

  As shown in FIG. 4, the secondary battery 210 according to the second embodiment has a positive current collector 142 coupled to a second housing part 231 of the positive electrode case 201 using a conductive fastening member 50, and 2 The structure is similar to the secondary battery of the first embodiment except for the structure in which the negative electrode current collector 152 is coupled to the housing 331. In the present embodiment, the coupling may be performed by a fastening structure such as a rivet or a bolt instead of welding. The same reference numerals are used for the same members as those of the secondary battery of the first embodiment.

  The second housing parts 231 and 331 of the positive and negative electrode cases 201 and 301 are formed with at least one opening 28 and 38 that exposes the positive and negative electrode current collectors 142 and 152, and the positive and negative electrode current collectors 142 and Also in 152, openings corresponding to the openings 28 and 38 of the second accommodating portions 231 and 331 are formed. As a result, the fastening member 50 passes through the second housing part 231 and the positive electrode current collector part 142, passes through the second housing part 331 and the negative electrode current collector part 152, and connects the positive electrode and the negative electrode current collector parts 142, 152 to the positive electrode and Fixed to the negative electrode cases 201 and 301.

  FIG. 5 is a cross-sectional view of a secondary battery according to the third embodiment of the present invention.

  As shown in FIG. 5, the secondary battery 220 of the third embodiment has a rectangular parallelepiped shape in which the first housing portions 221 and 321 of the positive and negative electrode cases 202 and 302 are open on both sides without an inclined portion. The second storage units 232 and 332 are similar to the secondary battery of the first embodiment except that the second storage units 232 and 332 are formed outside the first storage units 221 and 321 so as to be orthogonal to the first storage units 221 and 321. Consists of configuration. The same reference numerals are used for the same members as those of the secondary battery of the first embodiment.

  The first housing part 221 of the positive electrode case 202 surrounds a part of the central part 16 and the entire curved part 141 of the electrode assembly 10, and the second housing part 232 is orthogonal to the first housing part 221 and the positive electrode terminal 21. It is formed. The second housing part 232 forms at least one opening 29 that exposes the positive electrode current collector 142, and the positive electrode current collector 142 and the second housing part 232 are fixed by spot welding in the opening 29. The negative electrode case 302 is configured in the same shape as the positive electrode case 202.

  The central case 401 surrounds the entire central portion 16 of the electrode assembly 10, the first and second accommodating portions 221 and 232 of the positive electrode case 202, and the first and second accommodating portions 321 and 332 of the negative electrode case 302, and the second accommodating portion. The parts 232 and 332 are joined by thermal fusion. In this case, the sealing portions 411 of the positive and negative electrode cases 202 and 302 and the central case 401 are placed on the same line as the positive and negative electrode current collectors 142 and 152 along the thickness direction of the electrode assembly 10.

  In the secondary battery 220 of the third embodiment, the thickness of the second housing parts 232 and 332 is increased, and the overlapping area of the central case 401 with respect to the positive electrode case 202 and the negative electrode case 302 is increased. Structural stability can be further increased.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

200, 210, 220 Secondary battery 10 Electrode assembly 11 Positive electrode 12 Negative electrode 13 Separator 14 Positive electrode uncoated region 15 Negative electrode uncoated region 20 Positive electrode case 30 Negative electrode case 40 Central case

Claims (17)

  1. A central electrode portion including a positive electrode, a negative electrode and a separator;
    A first electrode portion extending from a first end of the central electrode portion;
    A second electrode portion extending from a second end located on the opposite side of the first end of the central electrode portion;
    A central case surrounding the central electrode portion;
    A first electrode case having electrical conductivity surrounding the first electrode part;
    A second electrode case having electrical conductivity surrounding the second electrode part;
    Including
    The first electrode case and the central case are fastened,
    The first electrode case has an overlapping portion that surrounds a part of the central electrode portion at the first end portion,
    The central case surrounds the overlapping portion of the first electrode case,
    The second electrode case and the central case are fastened,
    The second electrode case has an overlapping portion surrounding a part of the central electrode portion at the second end portion,
    The central case surrounds the overlapping portion of the second electrode case;
    A secondary battery characterized by that.
  2. The central case includes a material different from at least one of the first electrode case and the second electrode case.
    The secondary battery according to claim 1, wherein:
  3. The central case includes a laminate sheet in which a metal layer and a resin layer are joined by an adhesive layer.
    The secondary battery according to claim 1 or 2, characterized in that.
  4. At least one of the first electrode case and the second electrode case is formed with an inclined portion in an outer shape,
    The secondary battery according to any one of claims 1 to 3, wherein:
  5. At least one of the first electrode case and the second electrode case is formed with an inclined portion having an inclination angle substantially perpendicular to the outer shape.
    The secondary battery according to any one of claims 1 to 4, wherein the secondary battery is characterized by that.
  6. At least one of the first electrode part and the second electrode part includes a bending part and a current collecting part,
    The secondary battery according to any one of claims 1 to 3 , wherein the secondary battery is characterized by that.
  7. The first electrode case includes a first housing portion surrounding the curved portion of the first electrode portion, and a second housing portion surrounding the current collecting portion of the first electrode portion,
    The second electrode case includes a first housing portion that surrounds the curved portion of the second electrode portion, and a second housing portion that surrounds a current collecting portion of the second electrode portion.
    The secondary battery according to claim 6, wherein:
  8. The overlapping portion and the second accommodating portion of at least one of the first electrode case or the second electrode case are substantially parallel to each other,
    The first housing portion of the one electrode case, connecting the said superposition portion of said one electrode case the second housing part, formed to be inclined to the contour at an angle with respect to the superimposed portion Having an inclined portion,
    The secondary battery according to claim 7, wherein:
  9. The overlapping portion and the second accommodating portion of at least one of the first electrode case or the second electrode case are substantially parallel to each other,
    The first housing portion of the one electrode case has the overlapped portion and connecting the second housing portion, the inclined portion formed by substantially right angled from the superposition of the one electrode case ,
    The secondary battery according to claim 7, wherein:
  10. A sealing part is further included between at least one of the first electrode case or the second electrode case and the central case;
    The secondary battery according to any one of claims 1 to 9, wherein the secondary battery is characterized by that.
  11. A sealing part between the second case and the central case of at least one of the first electrode case or the second electrode case;
    At least one of the first electrode case or the second electrode case is formed with an inclined portion having an inclination angle substantially perpendicular to the outer shape.
    The secondary battery according to claim 7, wherein the secondary battery is a battery.
  12. At least one of the first electrode part or the second electrode part corresponds to a corresponding recess formed in the second accommodating part of the first electrode case or the second electrode case. Fixed to the first electrode case or the second electrode case;
    The secondary battery according to claim 7, wherein the secondary battery is characterized in that
  13. At least one of the current collectors of the first electrode part or the second electrode part has an opening formed in the second accommodating part of the corresponding first electrode case or the second electrode case; Fastened through a corresponding opening formed in the current collector of the first electrode part or the second electrode part,
    The secondary battery according to claim 7, wherein the secondary battery is a battery.
  14. The first electrode part and the second electrode part are fastened to the corresponding first electrode case or the second electrode case by a conductive fastening member,
    The secondary battery according to claim 13, wherein:
  15. At least one of the first electrode part or the second electrode part is fastened by a conductive fastening member;
    The secondary battery according to claim 13, wherein:
  16. An electrode terminal fastened to the second housing part of the first electrode case or the second housing part of the second electrode case;
    The secondary battery according to any one of claims 7 to 15, wherein the secondary battery is characterized in that
  17. At least one of the first electrode case or the second electrode case includes an electrode terminal,
    The secondary battery according to claim 4, wherein the secondary battery is a battery.
JP2010225755A 2009-10-13 2010-10-05 Secondary battery Expired - Fee Related JP5592221B2 (en)

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US12/860692 2010-08-20

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JP2011086623A (en) 2011-04-28
EP2337106A2 (en) 2011-06-22
EP2337106B1 (en) 2014-03-19
US20110086262A1 (en) 2011-04-14
KR101155918B1 (en) 2012-06-20
US8974952B2 (en) 2015-03-10
CN102044658B (en) 2013-10-02
EP2337106A3 (en) 2013-02-27
KR20110040662A (en) 2011-04-20

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